Miles between Thornton, CO and Frederick, MD

There are
1,637 mi
from Thornton, CO to Frederick, MD

That's the driving distance. It would take 1 day 5 hours to go from Thornton, Colorado to Frederick, Maryland.

The flight distance (direct flight from Thornton, CO to Frederick, MD) is 1,460.93 mi.

1,637 mi = 1.61 kms